Layer-by-layer assembly of partially sulfonated isotactic polystyrene with poly(vinylamine)

Hiroharu Ajiro; Klaus Beckerle; Jun Okuda; Mitsuru Akashi

doi:10.1021/la300627q

Layer-by-layer assembly of partially sulfonated isotactic polystyrene with poly(vinylamine)

Langmuir. 2012 Mar 27;28(12):5372-8. doi: 10.1021/la300627q. Epub 2012 Mar 19.

Authors

Hiroharu Ajiro¹, Klaus Beckerle, Jun Okuda, Mitsuru Akashi

Affiliation

¹ The Center for Advanced Medical Engineering and Informatics, Osaka University, 2-2 Yamada-oka, Suita, Osaka 565-0871, Japan.

PMID: 22390169
DOI: 10.1021/la300627q

Abstract

The stereoregular synthetic polymer isotactic polystyrene bearing partially sulfonated groups (SiPS) was used as a layer-by-layer assembled thin film for the first time. When a low molecular weight compound was employed as the pair for the alternative layer-by-layer (LbL) assembly, the frequency shift was very small using quartz crystal microbalance (QCM) analysis, whereas poly(vinylamine) (PVAm) formed an effective pair for the construction of LbL films with SiPS. When it was neutralized, SiPS was not assembled, probably due to the loss of effective polymer-polymer interactions. The ionic strength conditions revealed a slight difference of the assembly behavior on the isotactic polymer as compared to the atactic one. The assembled LbL film showed the same peaks over the range from 1141 to 1227 cm(-1) and 700 cm(-1) in the FT-IR/ATR spectra as the bulk complex of SiPS/PVAm, and the thickness on one side was calculated at 76 nm by QCM analysis. The surface roughness of the film was also observed by AFM.

Publication types

Research Support, Non-U.S. Gov't